Note that this does not work within an exception handler.
e.g.
<?php
function handler1(Exception $e) {
echo "handler1\n";
restore_exception_handler();
throw $e;
}
function handler2(Exception $e) {
echo "handler2\n";
}
set_exception_handler( 'handler2' );
set_exception_handler( 'handler1' );
throw new Exception( 'might expect to see handler1, handler2' );
/* Outputs:
handler1
PHP Fatal error: Uncaught exception 'Exception' with message 'might expect to see handler1, handler2' in /tmp/demo.php:15
Stack trace:
#0 {main}
thrown in /tmp/demo.php on line 15
*/
?>